<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Mutations Observer</title>
  <link rel="stylesheet" href="./css/main.css">
</head>
<body>
  <button onclick="addList()">添加列表</button>
  <button onclick="changeColor()">更改颜色</button>

  <ul>
    <li>This is a paragraph.</li>
  </ul>


  <!-- 引入 JS -->
  <script src="./js/main.js"></script>
</body>
</html>
